Projector Overdrive Control via Indirect Panel Temperature
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Solution Overview
Problem
Existing projector technologies face challenges in accurately performing overdrive control for liquid crystal display panels due to the complexity of accurately detecting temperature, which often requires multiple temperature sensors, complicating the control system and increasing space requirements.
Innovation Solution
A projector design that includes a temperature detector and a controller to determine the amount of overdrive based on detected temperature, allowing for appropriate overdrive control without the need for multiple sensors, by converting the detected temperature into the actual temperature of the liquid crystal display panel, considering factors like the filter's state and light source luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple temperature sensors are used to accurately detect the temperature of the liquid crystal display panel, then the measurement precision of panel temperature is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent introduces an intermediary approach by using a single temperature sensor to detect the temperature of a reference component (such as the backlight unit or housing) and then calculating the liquid crystal panel temperature through a predetermined temperature relationship. This mediator (reference component) allows indirect measurement of the panel temperature without direct contact, reducing the need for multiple sensors while maintaining measurement accuracy.
Solution Approach 2:
The system utilizes the temperature detection capability of a single sensor in conjunction with the inherent thermal relationships within the projector components. The controller automatically calculates the panel temperature based on the detected reference temperature and predetermined relationships, allowing the system to self-determine panel temperature without requiring additional sensors directly on the panel.
2Measurement precision
If multiple temperature sensors are disposed in the projector to detect panel temperature, then the measurement precision is improved, but the projector volume increases
Solution Approach 1:
By using a reference component's temperature as an intermediary measurement point, the system avoids the need for multiple sensors distributed throughout the projector. The single sensor detects temperature at a strategic location, and the controller calculates panel temperature based on the thermal relationship, thereby maintaining compact projector dimensions.
Solution Approach 2:
The patent combines the temperature detection function with the existing single temperature sensor in the projector, merging multiple measurement objectives into a single sensing point. By detecting the reference component temperature and using predetermined relationships, the system achieves panel temperature monitoring without adding multiple separate sensor installations that would increase projector volume.
3Ease of operation
If the amount of overdrive is determined based on detected temperature without considering driven state, then the control simplicity is improved, but the overdrive control accuracy deteriorates
Solution Approach 1:
The patent implements dynamic overdrive control by making the overdrive amount variable based on both temperature and driven state. The controller adjusts the overdrive compensation value according to the liquid crystal panel's temperature and its current driven state (such as display content characteristics), allowing the system to adapt to changing conditions while maintaining simple control operation through automated adjustment.
Solution Approach 2:
The system changes the overdrive control parameter dynamically based on detected temperature and driven state conditions. By modifying the overdrive compensation value according to these parameters, the system achieves accurate overdrive control without requiring complex manual intervention, as the controller automatically selects appropriate overdrive levels based on current operating conditions.
Data Source
AI summary
A projector in which a liquid crystal display panel modulates light emitted from a light source and the modulated image light is projected, the projector includes a temperature detector that detects a temperature in the projector and a controller that determines the amount of overdrive based on the temperature detected by the temperature detector in accordance with a driven state of the projector and performs overdrive control on the liquid crystal display panel based on the amount of overdrive.